Emissions credits likely worthless in reducing emissions, study says.

As nations grapple with how they can slash their emissions as part of theParis climate agreement, some may use international credit schemes that were approved in the treaty process. A new report from the European Commission casts serious doubts about such credits, however, concluding that the vast majority of them likely fail to actually reduce emissions.

The report, which was written last year but not published until this April, concludes that buying and selling emissions credits for overseas projects should be limited to a select list that meet rigorous standards, and used only as part of a transition to more effective policies for mitigating greenhouse gas emissions.

“Given the inherent shortcomings of crediting mechanisms, we recommend focusing climate mitigation efforts on forms of carbon pricing that do not rely extensively on credits,” the report said, adding that credits should play only a limited role after 2020.

“It’s a confirmation that offsetting is fundamentally problematic,” said Aki Kachi, international policy director forCarbon Market Watch, an advocacy group in Brussels.

The study examined theClean Development Mechanism, created under the Kyoto Protocol to allow countries to offset emissions by purchasing credits linked to green-energy projects on an international market. The system allows a power plant in Germany, for example, to buy credits for the emissions savings from a wind farm in India.

The problem, the report says, is that the Indian wind farm likely would have been built anyway, even without the credits purchased by the Germans. In emissions-trading lingo, the reduction would be considered not “additional.”

“Overall, our results suggest that 85 percent of the projects covered in this analysis and 73 percent of the potential 2013-2020 Certified Emissions Reduction (CER) supply have a low likelihood that emission reductions are additional and are not over-estimated,” said the report, which was prepared by the Öko-Institut e.V., a German research group. “Only 2 percent of the projects and 7 percent of potential CER supply have a high likelihood of ensuring that emission reductions are additional and are not over-estimated.”

In short, the vast majority of credits are unlikely to actually reduce emissions. And while the report examined the Clean Development Mechanism specifically, it said that many of the problems are inherent to emissions crediting schemes, and that the lessons learned would likely apply elsewhere.

The Paris Agreement left the door open on emissions trading, but it left the details undefined, Kachi said.

“Two years later we’re supposed to have more detailed rules for how these things will work under the Paris Agreement, but there’s been no progress,” he said. “It’s a controversial issue that the world definitely has found no consensus over.”

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